激光功率对Al2O3-ZrO2共晶陶瓷成形质量的影响

Influence of Laser Power on the Forming Quality of Al2O3-ZrO2 Eutectic Ceramic

摘要:

采用激光近净成形系统成形了Al2O3-ZrO2(Y2O3)共晶陶瓷，研究了激光功率对成形形貌以及陶瓷内部裂纹、气孔的影响规律，利用X射线衍射仪和扫描电镜对样件进行相成分分析和微观组织观察。研究表明，相对较高的激光功率可以得到裂纹以及气孔较少的陶瓷样件；陶瓷样件具有紧凑排列的胞状共晶组织，亚微米级t-ZrO2(Y2O3)纤维均匀分布在胞状共晶组织内部。由于激光近净成形加工具有层层堆积的特点，微观组织呈现出垂直于沉积方向的周期性带状组织

Abstract:

Al2O3-ZrO2(Y2O3) eutectic ceramics were produced by a laser engineered net shaping system. We preliminarily explored the law of forming morphology, internal cracks and pores of the ceramics with the change of laser power. X-ray diffractometer analysis and scanning electron microscopy observation were carried out for the sample phase composition and microstructure, respectively. The research indicates that higher laser power can get less internal cracks and pores of ceramic samples. The microstructure shows a well-ordered cellular eutectic structure made up by a homogeneous distribution of very fine submicron levels t-ZrO2(Y2O3) fibers embedded in the cellular. Periodic banded structure appears in the vertical direction of deposition due to the characteristics of layer by layer accumulation by laser engineered net shaping processing